Cruise Control Disengaged

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The ECM/PCM disengages the cruise control operation based on the signals from one of the following:

The brake pedal position (BPP) sensor
The on/off switch
The CANCEL switch

The BPP sensor is mounted on the brake pedal bracket. Pressing the brake pedal while the cruise control is engaged will disengage the Cruise Control System. The body control module (BCM) monitors the BPP sensor via the brake pedal position sensor signal circuit. The ECM detects a high voltage signal on stop lamp switch signal circuit from the BCM indicating that the brake pedal has been pressed. For further information on the BPP, refer to Exterior Lighting Systems Description and Operation .

The Cruise Control System will also disengage when the cruise control cancel switch is activated. The body control module (BCM) determines when the cruise control cancel switch is activated. When the normally open cancel switch is closed, the BCM detects a high signal voltage on the cruise control cancel switch signal circuit and sends a serial data message to the ECM/PCM to disengage the cruise control system.

When the cruise control on/off switch is turned OFF, the Cruise Control System will disengage.

The Cruise Control System will also disengage when the ECM/PCM detects that a driver override function has been active for approximately 60 seconds.

When Cruise Control System has been disengaged, the ECM/PCM sends a serial data message to the instrument panel cluster (IPC) in order to turn off the Cruise indicator.

The vehicle speed stored in memory will be erased when the cruise control On/Off switch is turned OFF, or the ignition switch is turned OFF.